Module indicator 

Core Indicator trait and IndicatorOutput type.

Mirrors indicators/base.py:

• Indicator ↔ class Indicator(Component, ABC)
• IndicatorOutput ↔ pd.DataFrame return value
• required_columns() ↔ @classmethod required_columns()
• calculate() ↔ def calculate(self, data, price_column)

Every indicator in trend/, momentum/, volume/, and other/ must implement this trait. The registry (registry.rs) stores Box<dyn Indicator> values so they can be created by name at runtime, matching Python’s @register_indicator / IndicatorRegistry.

Structs

IndicatorOutput

Named column output, analogous to pd.DataFrame returned by Python calculate().

Enums

PriceColumn

Which single OHLCV field to extract as a price series.

Traits

Indicator

The core trait every indicator must implement.